ui: Fix removing a number from the SequentialIDGenerator.

ui/base/sequential_id_generator.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_BASE_SEQUENTIAL_ID_GENERATOR_H_
 #define UI_BASE_SEQUENTIAL_ID_GENERATOR_H_
 
 #include <map>
 
 #include "base/basictypes.h"
@@ skipping 24 matching lines @@
   // use this ID.
   void ReleaseGeneratedID(uint32 id);
 
   // Removes the ID previously generated for |number| by calling
   // |GetGeneratedID()|.
   void ReleaseNumber(uint32 number);
 
  private:
   typedef base::hash_map<uint32, uint32> IDMap;
 
-  uint32 GetNextAvailableSlot();
+  uint32 GetNextAvailableID();
+
+  void UpdateNextAvailableIDAfterRelease(uint32 id);
 
   IDMap number_to_id_;
   IDMap id_to_number_;
 
   uint32 min_id_;
   uint32 min_available_id_;
 
   DISALLOW_COPY_AND_ASSIGN(SequentialIDGenerator);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_SEQUENTIAL_ID_GENERATOR_H_